HFBR-0507Z Datasheet, PDF (3/12 Pages) AVAGO TECHNOLOGIES LIMITED – 125 Megabaud Versatile Link The Versatile Fiber Optic Connection

Plastic Optical Fiber (1 mm POF) Transmitter Application Circuit: Performance of the HFBR-15X7Z transmitter in the recom-
mended application circuit (Figure 1) for POF; 1-125 MBd, 25°C.
Parameter
Symbol
Typical
Unit
Condition
Note
Average Optical Power 1 mm POF
P_avg
-9.7
dBm
50% Duty
Note 1, Fig 3
Cycle
Average Modulated Power 1 mm POF
Optical Rise Time (10% to 90%)
Optical Fall Time (90% to 10%)
High Level LED Current (On)
Low Level LED Current (Off )
Optical Overshoot - 1 mm POF
P
-11.3
dBm
mod
Note 2, Fig 3
t
2.1
ns
5 MHz
r
t
2.8
ns
5 MHz
f
I
19
mA
F,H
Note 3
I
3
mA
F,L
Note 3
45
%
Transmitter Application Circuit
Current Consumption - 1 mm POF
I
110
mA
CC
Figure 1
Hard Clad Silica Fiber (200 μm HCS) Transmitter Application Circuit: Performance of the HFBR-15X7Z transmitter in the recom-
mended application circuit (Figure 1) for HCS; 1-125 MBd, 25°C.
Parameter
Symbol
Typical Unit
Condition
Note
Average Optical Power 200 μm HCS
P
-14.6
dBm
50% Duty
Note 1, Fig 3
avg
Cycle
Average Modulated Power 200 μm HCS
Optical Rise Time (10% to 90%)
Optical Fall Time (90% to 10%)
High Level LED Current (On)
Low Level LED Current (Off)
Optical Overshoot - 200 μm HCS
P
-16.2
dBm
mod
Note 2, Fig 3
t_r
3.1
ns
5 MHz
t
3.4
ns
5 MHz
f
I
60
mA
F,H
Note 3
I
6
mA
F,L
Note 3
30
%
Transmitter Application Circuit
Current Consumption - 200 μm HCS
I
130
mA
CC
Figure 1
Notes:
1. Average optical power is measured with an average power meter at 50% duty cycle, after 1 meter of fiber.
2. To allow the LED to switch at high speeds, the recommended drive circuit modulates LED light output between two non-zero power levels.
The modulated (useful) power is the difference between the high and low level of light output power (transmitted) or input power (received),
which can be measured with an average power meter as a function of duty cycle (see Figure 3). Average Modulated Power is defined as one
half the slope of the average power versus duty cycle:
Average Modulated Power =
[P @ 80% duty cycle - P @ 20% duty cycle]
avg
avg
(2) [0.80 - 0.20]
3. High and low level LED currents refer to the current through the HFBR-15X7Z LED. The low level LED “off” current, sometimes referred to as
“hold-on” current, is prebias supplied to the LED during the off state to facilitate fast switching speeds.
3